Car truck



rats

GUSTAF ARVTD ANDERSON, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE T H SYIVIINGTON COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F DELAWARE s CAR TRUCK.

Specification of Letters Patent.

Patented May 2, 1922.

Application filed January 19, 1921. Serial No. 433,476.l

To all whom t may concern .Be it known that l, GUs'rAr ARviD AN- DnnsoN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Car Trucks; and I do hereby decla-re the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to car trucks and more particularlyto a flexible truck structure involving transversely spaced side frame members which Lre normally maintained in square relation by yielding means permitting them to have a relative displacement longitudinally of the truck in response to external forces such as are applied thereto when the truck passes around a curve or over imperfect switch points or defective rail joints.

The principal object of the invention is to provide efficient, durable and compactly arranged means for normally maintaining the side frames in square relation and for yieldingly resisting relative displacement of said side frames longitudinally of the truck from normal position. The principal feature of the invention by which this object is accomplished consists in mounting upon the means by which the side frames are movably connected transversely of the truck a plurality of leaf spring mechanisms which not only resist relative displacement of the side frames longitudinally of the truck but following such displacement restore them to normal position and tend yieldingly to maintain them in normal relation.

A further feature of the invention consists in providing means for maintaining the leaf spring mechanism under an initial predetermined load.

There are minor features of invention residing in particular details of construction and in special combinations of parts, all as will hereinafter appear.

In the drawings which illustrate the preferred embodiment of the invention, the scope whereof is pointed out in the claimsf- Figure l is a view, partly in plan and partly in section, of a car truck embodying the invention, the bolster, which is of the type commonly employed in flexible trucks, being omitted, and the truck parts being shown in a position such as they assume when the truck passes around a curve.

Figure 2 is a detail viewl, partly in plan and partly in horizontal section, showing the relation of the leaf spring mechanism to one hof the side frames and the cross connecting member of the truck.

.Figure 3 is a section on the line 3 3 Fig. 2.

ln the embodiment of my invention illustrated in the drawings, 1, l are transversely spaced side frame members which are adapted to be relatively movable longitudinally of the truck. At its opposite ends each of the side frames l is provided with journal boxes 2 receivingthe journal ends of the axles 3 upon which the truck wheels et are mounted.

The side frames are movably connected transversely ofv the truck by connecting means 5 which mayconveniently be the spring plank element of the truck. The opposite ends of the spring plank 5 extend into 1the bolster openings 6 of the side frames between the columns 7 thereof. Sufficient clearance is allowed between the edges of the spring plank and the inner faces of the columns 7 topermit the spring plank freely to change its angular relation to the side frames l upon a relative longitudinal displacement of the latter from their normal umns 7 of the side frame to allow said bolster to shift its angular relation with respect to the side frames without binding upon the columns. The movable connection between the spring. plank 5 and the side frames 1 may be conveniently effected by` providing each side frame with a centrally disposed upwardly extending pivot boss 8 which enters a correspondingly formed pivot opening 9 of the spring plank.

The transverse connecting member 5 has mounted thereon, preferably upon the under side thereof and in spaced relation with each other, a plurality of leaf spring means 10 for yieldingly resisting longitudinal displacement of the side frame members from normal. Each of these spring means l0 preferably comprises a plurality of leaf springs ll rigidly secured at one end to the spring plank 5, by means of a casting 12,

Q3 meiner? and spaced apart or separated at the opposite end so as to engage the inner side of the adjacent iframe member l. on opposite sides ot' the pivot boss S. rlChe separation of the spring leaves ll adjacent the side trame is preferably eected by means ot a Wedge or spreader 13 which may be secured to the cross connecting member' 5 byI means of a rivet let, the wedge being orced in between the leaves ll oi the spring mechanism in the assembly of the parts so as to subject said leaves to an initial predetermined load which must be overcome before any change in the normal angular relation oic the side trames l and spring plank 5 can occur; By this particular embodiment of my invention tbe truck may be maintained practically in square under .Substantially all normal service conditions, but the truck parts will be permitted to yield momentarily under excessive shocks or blows without detriment to the truck structure.

l. ln a car truck, the combination with side trame members which are relatively movable longitudinally olf the truck, ot means for movably connecting said side frame members, and a leaspring operatively interposed between said connecting means and one ot said side trames for yieldingly resisting relative longitudinal displacement oi said side trames trom normal position.

2. ln a car truck, the combination with side frame members which are relatively movable longitudinally ot the truck, ot means lio-r movably connecting said side frame members, and leal spring mechanism mounted on said connecting means and engaging one ot said side trames for yieldingly resisting relative longitudinal displacement oi5 said side trames from normal position.

3. ln a car truck, the combination With side Jframe members Which are relatively movable longitudinally ot the truck, of transversely extending means movably connected to each oll said side Yframe members, and a plurality ot leal? spring mechanisms mounted on said transversely extending means in spaced relation, each of said spring mechanisms engaging` an adjacent side trame member and being adapted to ailord yielding resistance to longitudinal displacement ot tlie adjacent side trame member from normal position a. ln a car truck, the combination with side frame members which are relatively movable longitudinally ot the truck, ot means itor movably connecting said side frame members, and leall spring means for resisting relative longitudinal displacement ot said side trame members from normal position.

5. ln a car track, the combination with side trame members which are relatively movable longitudinally ot' the truck, oit means tor movably connect-ing said side frame members, and leaf spring means for resisting relative longitudinal displacement et said side trame members from normal position, said leall spring means being subject to an initial predetermined load when the said side frame members and. connecting means are in normal position.

G. ln a car truck, the combinationV with side frame members which are relatively movable longitudinally otl the truck, of means Jfor movably connecting said side trame members, and lealc spring means for resisting relative longitudinal displacement ot said side trame members from normal position, said lea-t spring` means being secured at one end to said connecting means and its other end being tree and bearing upon one of said side trame members.

7. ln a car truck, tbe combination with side trame members which are relatively movable longitudinally of the truck, ot means for movably connecting said side trame members, and means tor yieldingly resisting relative longitudinal displacement et said side trame members from normal position, said last named means being mounted entirely upon said connecting means intermediate the ends ot said side traine members.

il. ln a car truck, the combination Witli sido trame members which are relatively movable longitudinally ot' the truck, ot means for movably connecting said side trame members, leali spring means ttor yieldingly resisting relative longitudinal displacement oi said side iframe members 'from normal position, and means independent ot said side iframe members tor maintaining said leaf spring means under an initial predetermined load.

9. ln a truck, the combination With side trames which are relatively movable longitudinally ot' the truck, of means for movably connecting` said side 'trame members, and leal' spring` means for yieldingly resisting relative longitudinal displacement ot said side trame members from normal position, said leaf spring means comprising a plurality ot lealA springs which are separated at one end.

l0. ln a ci r truck, the combination with side trame members which are relatively movable longitudinally oi' the truck, ot transversely extending means movably connected to each oi? said side trame members, and a plurality oi leal spring means for yieldingly resisting relative longitudinal' displacement ot said side frame members from normal position, said spring means being spaced transversely of the truck and arranged adjacent the respective side :trame members and each comprising a plurality ot leaf springsv which are separated at one end.

11. In a car truck, the combination with side frame members, of means for movably connecting said side frame members, and leaf spring means secured to and extending below said connecting means for yieldingly resisting relative longitudinal displacement of said side frame members from normal position.

12. In a car truck, the combination with side frame members Which are relatively movable longitudinally of the truck, of means for movably connecting said side frame members, and leaf spring means for yieldingly resisting relative longitudinal displacement of said side frame members from normal position, said leaf spring means being adapted to exert pressure upon the adjacent side frame member below said connecting means.

13. In a car truck, the combination With side frame members which are relatively movable longitudinally of the truck, of a spring plank movably connected at its opposite ends to said side frame members, and a plurality of leaf spring means mounted on said spring plank and respectively adapted to exert pressure on the corresponding side frame member to resist relative longitudinal displacement of the side frame members from normal position.

111. In a car truck, the combination with side fra-me members which are relatively movable longitudinally of the truck, of a spring plank pivotally connected at its opposite ends to said side frame members, a plurality of leaf spring means mounted on the under side of said spring plank and respectively adapted to exert pressure on the corresponding side frame member to resist relative longitudinal displacement of said side frame members from normal position, and means carried by said spring plank for maintaining said spring means under initial predetermined load.

15. In a car truck, the combination with side frame members which are relatively movable longitudinally of the truck, of a spring plank pivotally connected at its opposite ends to said Side frame members, a plurality of leaf spring means mounted on said spring plank and adapted to resist relative longitudinal displacement of said side frame members from normal position, said spring means being spaced transversely of the truck and each comprising a plurality of leaf springs which are separated at one end, and means carried by said spring plank for maintaining said separated relation of the ends of said springs.

16. In a car truck, the combination with side frame members which are relatively movable longitudinally of the truck, of a spring plank pivotally connected at its opposite ends to said side frame members, and a plurality of leaf spring means for yieldingly resisting relative longitudinal displacement of said side frame members from normal position7 said spring means being spaced transversely of the truck and arranged adjacent the respective side frame members and each comprising a plurality of leaf springs which are adapted to exert pressure upon the adjacent side frame member on opposite sides of its pivotal connection With said spring plank.

In testimony whereof I afliX my signature.

GUSTAF ARVID ANDERSON. 

